Get the Ford OEM gaskets, everything else will blow. I reused the OEM's for my long tubes and haven't had a problem yet................
Forgot, headers are a pain in the *** on the S197's. I had to pull the motor mounts and the starter to get them in there. I imagine even just replacing the gaskets you would have to do the same thing just to get in there even if you dont take the headers all the way out.
2005 Mustang GT, Pacesetter LT's with OR H-pipe, "Magna Pack" exhaust, Techco SC @ 9psi making 464whp & 449tq, steeda tri-ax shifter, 3D Carbon Eleanor Grill, Pioneer F90BT, FRPP 3.73 gears.
Get in, sit down, strap in, hold on, shut up!